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Operating Revenue (Schedule of Operating Revenue Recognition from Contracts with Customers) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating Revenue | [1] | $ 3,451 | $ 3,179 | $ 10,005 | $ 9,376
Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating Revenue | [2] | 2,232 | 2,154 | 5,809 | 5,732
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating Revenue | [3] | 423 | $ 401 | 1,408 | $ 1,313
Subsequent To Adoption of Revised Guidance |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 3,362 |  | 9,631 |
Nonregulated electric sales |  | 322 |  | 1,022 |
Nonregulated gas sales |  | 42 |  | 139 |
Nonregulated gas transportation and storage |  | 162 |  | 286 |
Other regulated revenues |  | 38 |  | 132 |
Other nonregulated revenues | [4],[5] | 133 |  | 410 |
Operating Revenue |  | 3,451 |  | 10,005 |
Subsequent To Adoption of Revised Guidance | FERC-regulated |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas transportation and storage |  | 266 |  | 800 |
Subsequent To Adoption of Revised Guidance | State-regulated |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas transportation and storage |  | 138 |  | 472 |
Subsequent To Adoption of Revised Guidance | Residential |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas sales |  | 73 |  | 553 |
Subsequent To Adoption of Revised Guidance | Commercial |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas sales |  | 15 |  | 152 |
Subsequent To Adoption of Revised Guidance | Other |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas sales |  | 3 |  | 14 |
Subsequent To Adoption of Revised Guidance | Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 2,210 |  | 5,787 |
Other regulated revenues |  | 30 |  | 95 |
Other nonregulated revenues | [4],[5] | 10 |  | 41 |
Operating Revenue |  | 2,232 |  | 5,809 |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 423 |  | 1,407 |
Nonregulated gas sales | [5] | 2 |  | 5 |
Other regulated revenues | [5] | 4 |  | 16 |
Other nonregulated revenues | [5] | 3 |  | 9 |
Operating Revenue |  | 423 |  | 1,408 |
Management service revenue | [5] | 50 |  | 157 |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC | FERC-regulated |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas transportation and storage | [5] | 179 |  | 561 |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC | State-regulated |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas transportation and storage | [5] | 131 |  | 450 |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC | Residential |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas sales |  | 12 |  | 54 |
Subsequent To Adoption of Revised Guidance | Dominion Energy Gas Holdings, LLC | Other |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Regulated gas sales |  | 0 |  | 9 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Residential |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 1,036 |  | 2,641 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Commercial |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 737 |  | 1,897 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Industrial |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 143 |  | 371 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Government and Other Retail |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 224 |  | 647 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Wholesale |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 30 |  | 95 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Virginia Electric and Power Company | Residential |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 1,036 |  | 2,641 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Virginia Electric and Power Company | Commercial |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 737 |  | 1,897 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Virginia Electric and Power Company | Industrial |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 143 |  | 371 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Virginia Electric and Power Company | Government and Other Retail |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 224 |  | 647 |
Subsequent To Adoption of Revised Guidance | Regulated Electric Sales | Virginia Electric and Power Company | Wholesale |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 30 |  | 95 |
Subsequent To Adoption of Revised Guidance | Other Revenues |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue | [4] | 89 |  | 374 |
Subsequent To Adoption of Revised Guidance | Other Revenues | Virginia Electric and Power Company |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue | [4],[5] | 22 |  | 22 |
Subsequent To Adoption of Revised Guidance | Other Revenues | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue |  | 0 |  | 1 |
Subsequent To Adoption of Revised Guidance | NGL Production | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |
Operating revenue | [4],[5] | $ 42 |  | $ 146 |
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 18 for amounts attributable to affiliates.
[3] | See Note 18 for amounts attributable to related parties.
[4] | Amounts above include $108 million and $91 million for the three months ended September 30, 2018, and $170 million and $138 million for the nine months ended September 30, 2018 primarily consisting of NGL sales at Dominion Energy and Dominion Energy Gas, respectively, which are considered to be goods transferred at a point in time. In addition, the amounts include $10 million and $11 million of sales of renewable energy investment tax credits at both Dominion Energy and Virginia Power for the three and nine months ended September 30, 2018, respectively, which are considered to be goods transferred at a point in time.
[5] | See Notes 10 and 18 for amounts attributable to related parties and affiliates.

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